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    <div id="write" class="">
      <h1>
        <a name="spim----mips运行时模拟器--的使用" class="md-header-anchor"></a
        ><code>SPIM -- MIPS运行时模拟器</code><span> 的使用</span>
      </h1>
      <p>
        <span>Oct 29, 2020</span> <span>By @</span
        ><a href="https://gitee.com/dandelight"><span>dandelight</span></a
        ><span>. Copyleft, No rights reversed.</span>
      </p>
      <h2>
        <a name="mips及mips模拟器" class="md-header-anchor"></a
        ><span>MIPS及MIPS模拟器</span>
      </h2>
      <ul>
        <li>
          <code>SPIM</code><span> is a self-contained simulator that runs </span
          ><code>MIPS32</code><span> assembly language programs. </span
          ><code>SPIM</code
          ><span>
            also provides a simple debugger and minimal set of operating system
            services.</span
          >
          <span>distributed under BSD License.</span>
        </li>
        <li>
          <a href="http://courses.missouristate.edu/kenvollmar/mars/"
            ><code>MARS</code></a
          >
        </li>
      </ul>
      <h2>
        <a name="下载与安装" class="md-header-anchor"></a
        ><span>下载与安装</span>
      </h2>
      <ul>
        <li>
          <p>
            <span>官网</span
            ><a href="http://spimsimulator.sourceforge.net/"
              ><span>SPIM MIPS simulator</span></a
            ><img
              src="presentation_Oct29.assets/image-20201028141609059.png"
              referrerpolicy="no-referrer"
              alt="image-20201028141609059"
            />
          </p>
        </li>
        <li>
          <p><span>下载</span></p>
          <ul>
            <li>
              <p>
                <a href="https://sourceforge.net/projects/spimsimulator/files/"
                  ><span>二进制安装程序</span></a
                >
              </p>
            </li>
            <li>
              <p>
                <img
                  src="presentation_Oct29.assets/image-20201028141817999.png"
                  referrerpolicy="no-referrer"
                  alt="image-20201028141817999"
                />
              </p>
              <ul>
                <li><span>Windows</span></li>
                <li><span>Debian-based Linux</span></li>
              </ul>
            </li>
            <li>
              <p>
                <a
                  href="https://sourceforge.net/p/spimsimulator/code/HEAD/tree/"
                  ><span>源码编译</span></a
                >
              </p>
            </li>
            <li>
              <p>
                <img
                  src="presentation_Oct29.assets/image-20201028141829709.png"
                  referrerpolicy="no-referrer"
                  alt="image-20201028141829709"
                />
              </p>
            </li>
          </ul>
        </li>
        <li>
          <p><span>安装</span></p>
          <ul>
            <li><span>双击打开安装即可</span></li>
            <li>
              <img
                src="presentation_Oct29.assets/image-20201028142119682.png"
                referrerpolicy="no-referrer"
                alt="image-20201028142119682"
              />
            </li>
          </ul>
        </li>
      </ul>
      <h2><a name="使用" class="md-header-anchor"></a><span>使用</span></h2>
      <ul>
        <li>
          <p><span>空启动</span></p>
          <ul>
            <li><span>点击</span><code>QtSpim</code><span>图标</span></li>
            <li>
              <img
                src="presentation_Oct29.assets/image-20201028142157785.png"
                referrerpolicy="no-referrer"
                alt="image-20201028142157785"
              />
            </li>
          </ul>
        </li>
      </ul>
      <ul>
        <li>
          <pre
            spellcheck="false"
            class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded"
            lang="bash"
          ><div class="CodeMirror cm-s-inner CodeMirror-wrap" lang="bash"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 0px; left: 37.1528px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: -28.9931px; width: 29px;"></div><div class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -28.9931px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 19px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" class="cm-tab-wrap-hack" style="padding-right: 0.1px;">qtspim<span class="cm-tab" role="presentation" cm-text="	">  </span><span class="cm-tab" role="presentation" cm-text="	">  </span></span></pre></div></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom: 0px solid transparent; top: 23px;"></div><div class="CodeMirror-gutters" style="height: 23px; left: 0.00694275px;"><div class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 28px;"></div></div></div></div></pre>
        </li>
      </ul>
      <ul>
        <li>
          <p>
            <span>Helloworld! (</span><code>${安装目录}/helloworld.s</code
            ><span>)</span>
          </p>
        </li>
        <li>
          <pre
            spellcheck="false"
            class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded"
            lang="assembly"
            style="break-inside: unset"
          ><div class="CodeMirror cm-s-inner CodeMirror-wrap" lang="assembly"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 0px; left: 44.1551px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 36px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>14</div></div></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: -35.9954px; width: 36px;"></div><div class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;<span class="cm-builtin">.data</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">msg:</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">3</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">  .asciiz <span class="cm-string">"Hello World"</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tab" role="presentation" cm-text="	">  </span><span class="cm-builtin">.extern</span> foobar 4</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; &nbsp;</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">6</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; <span class="cm-builtin">.text</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">.globl main</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">8</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">main:</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">li</span> $v0, 4 &nbsp; &nbsp; &nbsp; <span class="cm-comment"># syscall 4 (print_str)</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">la</span> $a0, msg &nbsp; &nbsp; <span class="cm-comment"># argument: string</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">11</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">syscall</span> &nbsp; &nbsp; &nbsp; &nbsp; <span class="cm-comment"># print the string</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">12</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">lw</span> $t1, foobar</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">13</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span cm-text="">​</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">14</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tab" role="presentation" cm-text="	">  </span><span class="cm-keyword">jr</span> $ra &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="cm-comment"># retrun to caller</span></span></pre></div></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom: 0px solid transparent; top: 318px;"></div><div class="CodeMirror-gutters" style="height: 318px; left: 0.00463104px;"><div class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 35px;"></div></div></div></div></pre>
          <p>
            <img
              src="presentation_Oct29.assets/image-20201028142509713.png"
              referrerpolicy="no-referrer"
              alt="image-20201028142509713"
            />
          </p>
        </li>
        <li>
          <p><span>最短的</span><code>MIPS</code><span>程序</span></p>
        </li>
        <li>
          <pre
            spellcheck="false"
            class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded"
            lang="assembly"
          ><div class="CodeMirror cm-s-inner CodeMirror-wrap" lang="assembly"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 0px; left: 37.1528px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 29px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>5</div></div></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: -28.9931px; width: 29px;"></div><div class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -28.9931px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 19px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># Shortest MIPS program</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -28.9931px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 19px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-builtin">.text</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -28.9931px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 19px;">3</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">  .globl main</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -28.9931px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 19px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">main:</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -28.9931px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 19px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">jr</span>  $ra</span></pre></div></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom: 0px solid transparent; top: 113px;"></div><div class="CodeMirror-gutters" style="height: 113px; left: 0.00694275px;"><div class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 28px;"></div></div></div></div></pre>
          <p><span>运行程序: 汇编源文件</span><code>helloworld.s</code></p>
          <ol start="">
            <li>
              <span>双击</span><code>QtSpim</code><span>图标 -&gt; </span
              ><code>Load File</code>
            </li>
            <li><span>控制台: </span><code>qtspim helloworld.s</code></li>
          </ol>
        </li>
      </ul>
      <h2>
        <a
          name="mips可执行程序的span-stylecolorgrey自我修养span要求"
          class="md-header-anchor"
        ></a
        ><code>MIPS</code><span>可执行程序的</span
        ><span style="color: grey"
          ><del><span>自我修养</span></del></span
        ><span>要求</span>
      </h2>
      <ul>
        <li><span>有</span><code>.data</code><span>(存储程序)</span></li>
        <li>
          <span>要有</span><code>main</code><span>标签(因为</span
          ><code>QtSpim</code><span>将用户编辑的程序当做子程序, 以</span
          ><code>main</code><span>标签对应的位置为入口.</span>
        </li>
        <li>
          <code>[00400014] 0c000000 jal 0x00000000 [main] ; 188: jal main</code
          ><span> </span>
        </li>
        <li>
          <span>可以同时导入多个汇编文件, 会在模拟内存</span
          ><code>data segment</code><span>中连续存储, 但是必须有且仅有一个</span
          ><code>main</code><span>才能运行</span>
        </li>
      </ul>
      <h2>
        <a name="认识qtspim界面及功能" class="md-header-anchor"></a
        ><span>认识</span><code>QtSpim</code><span>界面及功能</span>
      </h2>
      <p>
        <span>和各路</span><code>IDE</code
        ><span>比起来还是一个相当简单的环境. </span>
      </p>
      <h3><a name="主界面" class="md-header-anchor"></a><span>主界面</span></h3>
      <p>
        <img
          src="presentation_Oct29.assets/image-20201029125816936.png"
          referrerpolicy="no-referrer"
          alt="image-20201029125816936"
        />
      </p>
      <ul>
        <li>
          <p><span>MENU bar</span></p>
          <ul>
            <li><span>File</span></li>
            <li><span>Simulator</span></li>
            <li><span>Registers</span></li>
            <li><span>Text Segment</span></li>
            <li><span>Data Segment</span></li>
            <li><span>Window</span></li>
            <li><span>Help</span></li>
          </ul>
        </li>
        <li>
          <p><span>Tool bar</span></p>
          <ul>
            <li>
              <strong><span>文件载入</span></strong>
            </li>
            <li><span>Load File</span></li>
            <li><span>Reinitialize and Load File</span></li>
            <li>
              <strong><span>导出</span></strong>
            </li>
            <li><span>Save Log File</span></li>
            <li><span>Print</span></li>
            <li>
              <strong><span>保洁</span></strong>
            </li>
            <li><span>Clear Registers</span></li>
            <li><span>Reinitialize Simulator</span></li>
            <li>
              <strong><span>运行</span></strong>
            </li>
            <li><span>Run/Continue</span></li>
            <li><span>Pause</span></li>
            <li><span>Stop</span></li>
            <li>
              <span>Single Step(</span><kbd><span>F10</span></kbd
              ><span>)</span>
            </li>
            <li><span>View Help</span></li>
          </ul>
        </li>
        <li>
          <p><span>左侧: Registers寄存器组</span></p>
          <ul>
            <li><span>FP(Float-Point) Regs(不管它)</span></li>
            <li><span>Int(Integer) Regs</span></li>
          </ul>
        </li>
        <li>
          <p><span>右侧: Segment</span></p>
          <ul>
            <li><span>Data(数据段)</span></li>
            <li><span>Text(程序代码)</span></li>
          </ul>
        </li>
        <li>
          <p><span>下侧: 编译信息</span></p>
        </li>
      </ul>
      <p><span>不能改寄存器还是很不爽的.</span></p>
      <h3>
        <a name="console" class="md-header-anchor"></a><span>Console</span>
      </h3>
      <p>
        <span>控制台, 和</span><code>Windows</code><span>, </span
        ><code>macOS</code><span>, </span><code>Linux</code
        ><span>等的控制台(在定义上)并没有太大区别.</span>
      </p>
      <p>
        <img
          src="presentation_Oct29.assets/image-20201029125848201.png"
          referrerpolicy="no-referrer"
          alt="image-20201029125848201"
        /><em><span>要裁剪一下</span></em>
      </p>
      <h2>
        <a name="bonus-track" class="md-header-anchor"></a
        ><span>Bonus Track</span>
      </h2>
      <ul>
        <li>
          <p><span>递归计算阶乘</span></p>
        </li>
        <li>
          <pre
            spellcheck="false"
            class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded"
            lang="assembly"
            style="break-inside: unset"
          ><div class="CodeMirror cm-s-inner CodeMirror-wrap" lang="assembly"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 0px; left: 44.1551px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 36px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>30</div></div></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: -35.9954px; width: 36px;"></div><div class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-builtin">.text</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">.globl main</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">3</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">main:</span><span class="cm-tab" role="presentation" cm-text="	"> </span><span class="cm-tab" role="presentation" cm-text="	">  </span><span class="cm-comment"># 程序入口</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $a0, $zero, 4</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $<span class="cm-variable">sp</span>, $<span class="cm-variable">sp</span>, -4</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">6</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">sw</span> &nbsp;  $ra, 0($<span class="cm-variable">sp</span>)</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">7</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">jal</span> &nbsp; <span class="cm-keyword">fact</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">8</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># add &nbsp; $v1, $zero, $v0</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">9</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-comment"># Because later we'll need to store use $v0 to syscall 10(exit)</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">10</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">move</span>  $v1, $v0 &nbsp;<span class="cm-comment"># 会被SPIM汇编</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">11</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">lw</span> &nbsp;  $ra, 0($<span class="cm-variable">sp</span>)</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">12</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">jr</span> &nbsp;  $ra</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">13</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span cm-text="">​</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">14</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">fact:</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">15</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $<span class="cm-variable">sp</span>, $<span class="cm-variable">sp</span>, -8</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">16</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">sw</span> &nbsp;  $a0, 0($<span class="cm-variable">sp</span>)</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">17</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">sw</span> &nbsp;  $ra, 4($<span class="cm-variable">sp</span>)</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">18</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">slti</span>  $t0, $a0, 1</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">19</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">beq</span> &nbsp; $t0, $zero, L1</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">20</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $v0, $zero, 1</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">21</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $<span class="cm-variable">sp</span>, $<span class="cm-variable">sp</span>, 8</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">22</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">jr</span> &nbsp;  $ra</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">23</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-tag">L1:</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">24</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $a0, $a0, -1</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">25</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">jal</span> &nbsp; <span class="cm-keyword">fact</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">26</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">lw</span> &nbsp;  $a0, 0($<span class="cm-variable">sp</span>)</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">27</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">lw</span> &nbsp;  $ra, 4($<span class="cm-variable">sp</span>)</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">28</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">addi</span>  $<span class="cm-variable">sp</span>, $<span class="cm-variable">sp</span>, 8</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 27px;">29</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">mul</span> &nbsp; $v0, $a0, $v0</span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -35.9954px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 27px;">30</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp;<span class="cm-keyword">jr</span> &nbsp;  $ra</span></pre></div></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom: 0px solid transparent; top: 681px;"></div><div class="CodeMirror-gutters" style="height: 681px; left: 0.00463104px;"><div class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 35px;"></div></div></div></div></pre>
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            <del><code>Warshall</code><span>算法</span></del>
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